feat(cfg): add prettierd formatting on save

lua/custom/plugins/null-ls.lua

@@ -0,0 +1,43 @@
+return {
+    'jose-elias-alvarez/null-ls.nvim',
+    dependencies = {
+        "nvim-lua/plenary.nvim",
+    },
+
+    config = function()
+
+        local null_ls = require("null-ls")
+
+        local group = vim.api.nvim_create_augroup("lsp_format_on_save", { clear = false })
+        local event = "BufWritePre" -- or "BufWritePost"
+        local async = event == "BufWritePost"
+
+        null_ls.setup({
+            on_attach = function(client, bufnr)
+                if client.supports_method("textDocument/formatting") then
+                    vim.keymap.set("n", "<Leader>f", function()
+                        vim.lsp.buf.format({ bufnr = vim.api.nvim_get_current_buf() })
+                    end, { buffer = bufnr, desc = "[lsp] format" })
+
+                    -- format on save
+                    vim.api.nvim_clear_autocmds({ buffer = bufnr, group = group })
+                    vim.api.nvim_create_autocmd(event, {
+                        buffer = bufnr,
+                        group = group,
+                        callback = function()
+                            vim.lsp.buf.format({ bufnr = bufnr, async = async })
+                        end,
+                        desc = "[lsp] format on save",
+                    })
+                end
+
+                if client.supports_method("textDocument/rangeFormatting") then
+                    vim.keymap.set("x", "<Leader>f", function()
+                        vim.lsp.buf.format({ bufnr = vim.api.nvim_get_current_buf() })
+                    end, { buffer = bufnr, desc = "[lsp] format" })
+                end
+            end,
+        })
+
+    end,
+}

lua/custom/plugins/prettier.lua

@@ -0,0 +1,43 @@
+return {
+    'MunifTanjim/prettier.nvim',
+
+    config = function()
+
+        local prettier = require("prettier")
+
+        prettier.setup({
+            bin = 'prettier', -- or `'prettierd'` (v0.23.3+)
+            filetypes = {
+                "css",
+                "graphql",
+                "html",
+                "javascript",
+                "javascriptreact",
+                "json",
+                "less",
+                "markdown",
+                "scss",
+                "typescript",
+                "typescriptreact",
+                "yaml",
+            },
+        })
+
+        prettier.setup({
+            ["null-ls"] = {
+                condition = function()
+                    return prettier.config_exists({
+                        -- if `false`, skips checking `package.json` for `"prettier"` key
+                        check_package_json = true,
+                    })
+                end,
+                runtime_condition = function(params)
+                    -- return false to skip running prettier
+                    return true
+                end,
+                timeout = 5000,
+            }
+        })
+
+    end,
+}